| 摘要 |
An open circuit measuring system (10) for discerning the vertical distance between selected locations is provided. The system includes first and further members, each having a base portion (14) with a bottom (16), and an upright tube (18) which contains liquid. The tube (18) is open at its top, and extends upwardly from the base portion (14). Fluid communication is provided between the tubes proximate their lower portions (22). A scale is carried by the tubes along their lengths, such that a user can discern, as marked by the level of liquid in the tube (18), the distance in selected units of measure between the bottoms of the first and further base portions.
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